Thermodynamic potential of using a counter rotating novel axial impeller to compress water vapor as refrigerant / Qubo Li in International journal of refrigeration, Vol. 34 N° 5 (Août 2011)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 34 N° 5 (Août 2011) . - pp. 1286-1295 Titre : Thermodynamic potential of using a counter rotating novel axial impeller to compress water vapor as refrigerant Titre original : Potentiel thermodynamique d'un nouveau compresseur axial, utilisé pour comprimer de la vapeur d'eau utilisée en tant que frigorigène, avec roue complémentaire tournant à contre sens Type de document : texte imprimé Auteurs : Qubo Li, Auteur ; Janusz Piechna, Auteur ; Müller, Norbert, Auteur Année de publication : 2011 Article en page(s) : pp. 1286-1295 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Water vapor refrigerant (R718) Axial compressor Computational fluid dynamics Refrigeration Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper investigates the thermodynamic potential of using multi-stage variable speed counter rotating axial impellers as part of a water chiller system to compress water vapor (R718) as refrigerant. For this multi-stage compressor a modified cycle with an intercooling strategy is used between stages. Multi-stage compression with flash intercooling results in at least 30% improvement of coefficient of performance (COP) at full load compared to conventional refrigerants like R134a. Novel axial composite impellers, manufactured at extremely low cost, are proposed to take the compression role. To predict this counter rotating axial impeller’s thermodynamic capacity, a numeric CFD approach is taken in the study to generate steady state performance maps; based on the maps it is found that maximum pressure ratio of single counter rotating stage reaches 1.3 with isentropic efficiency around 70%. The aim of this study is to demonstrate that this counter rotating novel axial impeller has the potential to produce a high enough pressure ratio, and with a practical isentropic efficiency, in a multi-stage compressor to compress water vapor as refrigerant. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071100065X [article] Thermodynamic potential of using a counter rotating novel axial impeller to compress water vapor as refrigerant = Potentiel thermodynamique d'un nouveau compresseur axial, utilisé pour comprimer de la vapeur d'eau utilisée en tant que frigorigène, avec roue complémentaire tournant à contre sens [texte imprimé] / Qubo Li, Auteur ; Janusz Piechna, Auteur ; Müller, Norbert, Auteur . - 2011 . - pp. 1286-1295. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 5 (Août 2011) . - pp. 1286-1295 Mots-clés : Water vapor refrigerant (R718) Axial compressor Computational fluid dynamics Refrigeration Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper investigates the thermodynamic potential of using multi-stage variable speed counter rotating axial impellers as part of a water chiller system to compress water vapor (R718) as refrigerant. For this multi-stage compressor a modified cycle with an intercooling strategy is used between stages. Multi-stage compression with flash intercooling results in at least 30% improvement of coefficient of performance (COP) at full load compared to conventional refrigerants like R134a. Novel axial composite impellers, manufactured at extremely low cost, are proposed to take the compression role. To predict this counter rotating axial impeller’s thermodynamic capacity, a numeric CFD approach is taken in the study to generate steady state performance maps; based on the maps it is found that maximum pressure ratio of single counter rotating stage reaches 1.3 with isentropic efficiency around 70%. The aim of this study is to demonstrate that this counter rotating novel axial impeller has the potential to produce a high enough pressure ratio, and with a practical isentropic efficiency, in a multi-stage compressor to compress water vapor as refrigerant. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071100065X

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